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Journal : Quantum Teknika

Karakteristik Refrigeran Musicool Dalam Mesin Refrigerasi Kompresi Uap Menggunakan Evaporator Ganda Purnomo, Bagiyo Condro; Widodo, Noto; Munahar, Suroto; Nugroho, Dimas
Quantum Teknika : Jurnal Teknik Mesin Terapan Vol 1, No 2 (2020): April
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/jqt.010208

Abstract

Musicool is an alternative refrigerant developed as a working fluid in a steam compression refrigeration system. Musicool has many advantages compared to conventional refrigerants, the advantage is that it is environmentally friendly. This study aims to determine the characteristics of musicool 134 on a steam compression refrigeration machine using a double evaporator. The test is done by comparing the characteristics of a single evaporator refrigeration machine and a double evaporator using musicool 134. The research variable is the air flow through the evaporator that is equal to 0.022 kg / s, 0.027 kg / s, 0.033 kg / s. The test data is taken by measuring the temperature and pressure of each component in the refrigeration machine, then using the P-h diagram musicool 134, to determine the performance of the refrigeration machine. The results of the study provide information that the use of a double evaporator will give rise to an improved refrigeration system performance compared to using a single evaporator.
Pengaruh Tekanan Kompresi Terhadap Daya dan Torsi Pada Engine Single Piston Purnomo, Bagiyo Condro; Munahar, Suroto
Quantum Teknika : Jurnal Teknik Mesin Terapan Vol 1, No 1 (2019): October
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/jqt.010103

Abstract

LPG is an alternative fuel as fuel oil (BBM) which has a higher octane and energy value compared to BBM, and produces lower exhaust emissions. However, engine performance has decreased. This research presents an analysis of the performance of a single piston 4-stroke LPG engine with changes in compression pressure. Tests were carried out to determine the power and torque with variable pressure compression of  9 bar, 9.5 bar and 10 bar. The test results show that a single piston 4-stroke LPG engine with 9 Bar compression pressure produces a maximum torque of  9.77 Nm at 3380 rpm and a maximum power of 6.7 HP at 5870 rpm. Whereas the 10 Bar compression pressure produces a maximum torque value of 10.79 Nm at 3689 rpm and a maximum power of 6.9 hp at 5936 rpm. The conclusion of this research is that the higher the engine compression pressure, the higher the thermal efficiency in the combustion chamber so that engine performance increases